From: merez@codeaurora.org
To: Colin King <colin.king@canonical.com>
Cc: Kalle Valo <kvalo@codeaurora.org>,
"David S . Miller" <davem@davemloft.net>,
linux-wireless@vger.kernel.org, wil6210@qti.qualcomm.com,
netdev@vger.kernel.org, kernel-janitors@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH][next] wil6210: fix wil_cid_valid with negative cid values
Date: Thu, 04 Jul 2019 10:53:09 +0300 [thread overview]
Message-ID: <787a6680930c6895d8ede457ec543fb7@codeaurora.org> (raw)
In-Reply-To: <20190702144026.13013-1-colin.king@canonical.com>
On 2019-07-02 17:40, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> There are several occasions where a negative cid value is passed
> into wil_cid_valid and this is converted into a u8 causing the
> range check of cid >= 0 to always succeed. Fix this by making
> the cid argument an int to handle any -ve error value of cid.
>
> An example of this behaviour is in wil_cfg80211_dump_station,
> where cid is assigned -ENOENT if the call to wil_find_cid_by_idx
> fails, and this -ve value is passed to wil_cid_valid. I believe
> that the conversion of -ENOENT to the u8 value 254 which is
> greater than wil->max_assoc_sta causes wil_find_cid_by_idx to
> currently work fine, but I think is by luck and not the
> intended behaviour.
>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> drivers/net/wireless/ath/wil6210/wil6210.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/ath/wil6210/wil6210.h
> b/drivers/net/wireless/ath/wil6210/wil6210.h
> index 6f456b311a39..25a1adcb38eb 100644
> --- a/drivers/net/wireless/ath/wil6210/wil6210.h
> +++ b/drivers/net/wireless/ath/wil6210/wil6210.h
> @@ -1144,7 +1144,7 @@ static inline void wil_c(struct wil6210_priv
> *wil, u32 reg, u32 val)
> /**
> * wil_cid_valid - check cid is valid
> */
> -static inline bool wil_cid_valid(struct wil6210_priv *wil, u8 cid)
> +static inline bool wil_cid_valid(struct wil6210_priv *wil, int cid)
> {
> return (cid >= 0 && cid < wil->max_assoc_sta);
> }
Reviewed-by: Maya Erez <merez@codeaurora.org>
--
Maya Erez
Qualcomm Israel, Inc. on behalf of Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project
next prev parent reply other threads:[~2019-07-04 7:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-02 14:40 [PATCH][next] wil6210: fix wil_cid_valid with negative cid values Colin King
2019-07-04 7:53 ` merez [this message]
2019-09-04 6:05 ` Kalle Valo
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